Dr. Sanjay Prabhu has more than twenty years of teaching experience, at various levels. This makes him uniquely positioned among the authors to link the present book with the previous knowledge of the students. He has been a part of the author’s team for the BIOLOGY textbooks of FYJC and SYJC published by Maharashtra State Bureau of Textbook Production and Curriculum Research, Pune. Other than being a teacher, he is also an amateur environmentalist, an avid bird photographer.